Thank you for contacting Samsung KSA
The old version(Q OS) has worked as content hidden when locked, but R OS, the concept was changed.
the content hidden will be kept regardless of secure folder locked state if user set 'show contents' to off in secure folder setting
This concept change came from security report to enhance security.
After updating, you will not be able to downgrade to the old software because of updates to the security policy
If you do have any further queries, please do not hesitate to contact us.
Hope you and your family staying healthy and safe!